Ok, I've never increased or decreased in knitting before and I am confused. The pattern I want to make calls for me to increase every stitch for one row.
I have no idea how to do this. I looked up videos on how to increase but how do I increase every stitch?

If you are actually supposed to increase in every stitch, you would need to use a knit front back increase. That is about the most basic one anyway. You knit into the stitch like normal, but don't slip it off the needle. Then you move your right hand (RH) needle tip around behind the left hand needle tip and knit into the back loop of the same stitch. You can do that in every stitch in the row and you will have twice as many as you started with. The videos will have this increase. Just repeat it in each stitch across.